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软土地基上海堤的沉降及稳定性是围垦海堤工程的关键问题。针对海堤工程开展离心机模型试验,分别通过变加速度法及恒加速度法模拟海堤填筑过程和竣工后稳定运行过程,得到了海堤施工期及工后沉降变化规律,并通过PIV技术观察海堤的破坏模式;在此基础上,采用Geo Studio软件分别基于总应力及有效应力分析法,分析了海堤施工期及竣工后稳定运行期海堤的整体稳定性随时间变化规律。物理和数值模拟结果表明,离心模型试验能一定程度上模拟海堤的变形及失稳情况,且与数值分析结果吻合较好。海堤施工期瞬时失稳的滑裂面贯穿软土地基,并使海堤滑体发生了超过1 m的瞬时沉降。海堤填筑完成后地基超静孔隙水压力逐渐消散、海堤稳定性安全系数随时间不断提高。海堤竖向和水平位移最大值分别位于堤轴线处及坡脚处。
The settlement and stability of the dike on soft soil foundation are the key problems in the reclamation of the dike. Centrifuge model test was carried out for the seawall project, the seafill filling process and the steady operation process were simulated by variable speed method and constant acceleration method respectively, and the regularity of seawall construction and post-construction settlement was obtained. Through PIV technology observation On the basis of this, the Geo Studio software was used to analyze the regularity of the whole stability of the seawall as a function of time during the construction period of the sea wall and the stabilized operation period after completion based on the total stress and the effective stress analysis method respectively. The results of physical and numerical simulation show that the centrifugal model test can simulate the deformation and instability of the seawall to a certain extent, and is in good agreement with the numerical analysis. The instantaneous instability of the slip wall during the construction period of the sea wall runs through the soft soil foundation, and the instantaneous settlement of the seawall body over 1 m occurs. After the completion of seabed filling, the excess pore water pressure gradually dissipated and the safety factor of seawall stability improved with time. The vertical and horizontal displacements of the seawall are located at the embankment axis and the foot of the slope, respectively.